What is the impact on the system if the cable length from the inverter to the motor exceeds the standard cable length of the inverter?

Cable is an important part of connecting the inverter and the motor. The standard cable length is specified according to the design and performance indicators of the inverter. Exceeding the standard cable length may have some impact on the system. This article will introduce in detail the impact and solution of the inverter-to-motor cable length exceeding the standard.

1. Impact of cable length exceeding the standard

The inverter-to-motor cable length exceeding the standard may cause the following impacts:

1.1 Increased cable loss: Increased cable length will increase the internal resistance and inductance of the cable, resulting in increased cable loss. This will increase the power loss of the cable, reduce the energy transmission efficiency, and affect the overall efficiency of the system.

1.2 Reduced voltage: Increased cable length will increase the cable resistance, resulting in reduced voltage. The motor working at low voltage will lead to performance degradation or even failure to operate normally.

1.3 Increased current: Increased cable length will increase the cable resistance, resulting in increased current. The current required for the motor to work will increase, and the output current of the inverter will also increase accordingly. This may cause the inverter to work in an overloaded state, reduce the life of the inverter, or even damage the inverter.

1.4 Increased electromagnetic interference: Cables are the conductive medium for electromagnetic signals. Increased cable length will lead to increased electromagnetic signal interference on the cable. This may have adverse effects on other devices in the system, such as interfering with the signals of sensors or other control devices.

2. Methods for dealing with overlong cables

When the cable length exceeds the standard cable length of the inverter, the following methods can be used to solve the problem:

2.1 Use a larger cable cross-sectional area: In order to reduce cable loss and voltage drop, cables with larger cross-sectional areas can be used to reduce the resistance of the cable. This will increase the cost and volume of the cable, but can effectively improve the transmission efficiency of the system.

2.2 Increase the output voltage of the inverter: If the cable length exceeds the inverter standard, you can consider increasing the output voltage of the inverter. By increasing the output voltage, you can compensate for the voltage drop caused by the increase in cable length and ensure the normal operation of the motor. However, it should be noted that increasing the output voltage of the inverter may cause other problems, such as motor overload or excessive temperature rise.

2.3 Use relay equipment: When the cable length exceeds the standard, you can consider using relay equipment to strengthen signal transmission. Relay equipment can amplify and retransmit the signal to compensate for signal loss. This method can effectively reduce cable loss and signal attenuation, and improve the stability and reliability of the system.

2.4 Replace with special cables: Some manufacturers provide some special cables suitable for ultra-long distance transmission. These cables use special designs and materials to reduce cable loss and voltage drop and improve transmission efficiency. The use of these special cables may increase costs, but it can solve the problem caused by excessive cable length.

2.5 Rewiring: When the cable length exceeds the inverter standard, you can consider rewiring to reduce the cable length. By adjusting the layout of the inverter and the motor and shortening the distance of the cable connection as much as possible, you can reduce the cable loss and voltage drop and improve the transmission efficiency of the system.

In summary, when the cable length from the inverter to the motor exceeds the standard, it may have some effects on the system, such as increased cable loss, reduced voltage, increased current and increased electromagnetic interference. In order to solve these problems, you can use a larger cable cross-sectional area, increase the output voltage of the inverter, use relay equipment, replace with special cables and rewire. These methods can effectively solve the problems caused by ultra-long cables and improve the stability and reliability of the system.